A long current carrying wire, carrying current such that it is flowing out from the plane of paper, is placed at `O`. A steady state current is flowing in the loop `ABCD`. Then

Options

A. the net force is zero
B. as seen from `O` , the loop will rotate in clock wise direction along axis `O O'`.
C. BOTH `1 & 2` are correct.
D. as seen from `O` , the loop will rotate in anticlock wise direction along axis `O O'`.

Answer

3

Explanation

Net force on `AB` and `CD` will be zero because magnetic field due to `I_(1)` is along these parts. Force on `BC` due to `I_(1)` will be outwards and on `AB` will be inwards. This will provide clockwise torque as seen from `O`.